Medicare is best described as:

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Medicare is a federal health insurance program that mainly serves people aged 65 and older, along with some younger individuals who have certain disabilities or diseases. Because it is funded and administered by the federal government and covers a huge portion of the population, it is the largest health insurance program in the United States. It is not limited to people under 18, it is not run by states, and while it covers many medical services, it does not provide universal dental coverage for all beneficiaries.